Longitudinal dynamics control system in motor vehicles

Abstract

A system for controlling longitudinal dynamics in motor vehicles by which, starting from an actual vehicle velocity, a new desired vehicle velocity is to be adjusted. A functional module is provided by which a desired wheel torque course is determined for reaching the desired vehicle velocity, the course at least in a main section being proportional to the reciprocal value of the vehicle velocity and which is outputted to potential regulating systems for the conversion of the desired wheel torque course.

1. A longitudinal dynamics control system for motor vehicles arranged to cause adjustment of an actual vehicle velocity to a desired vehicle velocity, comprising:
 a functional module arranged to receive actual vehicle velocity information and desired vehicle velocity information, and to output a signal to at least one vehicle regulating system to obtain a desired wheel torque course, 
 wherein said functional module is programmed to determine the desired wheel torque course for reaching the desired vehicle velocity based on predefined data relating vehicle velocity to wheel torque, and at least in a section of the desired wheel torque course, the desired wheel torque course is proportional to a reciprocal of the vehicle velocity. 
 
   
   
     2. The longitudinal dynamics control system according to  claim 1 , wherein
 in at least the section of the desired wheel torque course in which the desired wheel torque course is proportional to the reciprocal of vehicle velocity, the desired wheel torque course is selected between a maximum possible desired wheel torque course and a wheel torque required for keeping the desired vehicle velocity constant. 
 
   
   
     3. The longitudinal dynamics control system according to  claim 1 , wherein
 the desired wheel torque course includes a starting section, a main section and an end section, and 
 the starting section and the end section are transition sections with constant gradients. 
 
   
   
     4. The longitudinal dynamics control system according to  claim 2 , wherein
 the desired wheel torque course includes a starting section, a main section and an end section, and 
 the starting section and the end section are transition sections with constant gradients. 
 
   
   
     5. The longitudinal dynamics control system according to  claim 1 , wherein
 a starting point of the desired wheel torque course is a wheel torque required for keeping the actual vehicle velocity constant. 
 
   
   
     6. The longitudinal dynamics control system according to  claim 3 , wherein
 a starting point of the desired wheel torque course is a wheel torque required for keeping the actual vehicle velocity constant. 
 
   
   
     7. The longitudinal dynamics control system according to  claim 4 , wherein
 a starting point of the desired wheel torque course is a wheel torque required for keeping the actual vehicle velocity constant. 
 
   
   
     8. The longitudinal dynamics control system according to  claim 5 , wherein
 an end point of the desired wheel torque course is a wheel torque required for keeping the desired vehicle velocity constant. 
 
   
   
     9. The longitudinal dynamics control system according to  claim 6 , wherein
 an end point of the desired wheel torque course is a wheel torque required for keeping the desired vehicle velocity constant. 
 
   
   
     10. The longitudinal dynamics control system according to  claim 7 , wherein
 an end point of the desired wheel torque course is the wheel torque required for keeping the desired vehicle velocity constant. 
 
   
   
     11. The longitudinal dynamics control system according to  claim 1 , wherein
 the desired vehicle velocity is a predetermined constant vehicle velocity. 
 
   
   
     12. A method for longitudinal dynamics control for motor vehicles, comprising the acts of:
 receiving in a functional module actual vehicle velocity information and desired vehicle velocity information; 
 determining a desired wheel torque course for reaching the desired vehicle velocity based on predefined data relating vehicle velocity to wheel torque, wherein at least in a section of the desired wheel torque course, the desired wheel torque course is proportional to a reciprocal of the vehicle velocity; and 
 outputting a signal to at least one vehicle regulating system to obtain a desired wheel torque course to cause adjustment of the actual vehicle velocity to the desired vehicle velocity. 
 
   
   
     13. The method for longitudinal dynamics control according to  claim 12 , wherein
 in at least the section of the desired wheel torque course in which the desired wheel torque course is proportional to the reciprocal of vehicle velocity, the desired wheel torque course is selected between a maximum possible desired wheel torque course and a wheel torque required for keeping the desired vehicle velocity constant. 
 
   
   
     14. The method for longitudinal dynamics control according to  claim 12 , wherein
 the desired wheel torque course includes a starting section, a main section and an end section, and 
 the starting section and the end section are transition sections with constant gradients. 
 
   
   
     15. The method for longitudinal dynamics control according to  claim 13 , wherein
 the desired wheel torque course includes a starting section, a main section and an end section, and 
 the starting section and the end section are transition sections with constant gradients. 
 
   
   
     16. The method for longitudinal dynamics control according to  claim 15 , wherein
 a starting point of the desired wheel torque course is a wheel torque required for keeping the actual vehicle velocity constant. 
 
   
   
     17. The method for longitudinal dynamics control according to  claim 16 , wherein
 an end point of the desired wheel torque course is a wheel torque required for keeping the desired vehicle velocity constant.